Welcome to the Tweaking4All community forums!
When participating, please keep the Forum Rules in mind!
Topics for particular software or systems: Start your topic link with the name of the application or system.
For example “MacOS X – Your question“, or “MS Word – Your Tip or Trick“.
Please note that switching to another language when reading a post will not bring you to the same post, in Dutch, as there is no translation for that post!
In case you want to extract certain subtitles from videos files (typically MP4 or MKV) then ffmpeg can be sure helpful to extract subtitles in bulk and per language (assuming language is properly set in the video file ofcourse).
To extract all Dutch (nld) subtitles from MP4 files, and save each as filename.nld.srt:
for f in *.mp4; do ffmpeg -i "$f" -map 0:s:m:language:nld "${f%.*}.nld.srt"; done
Or another example, extract all English (eng) susbtitles from MKV files and save them as as filename.eng.srt:
for f in *.mkv; do ffmpeg -i "$f" -map 0:s:m:language:eng "${f%.*}.eng.srt"; done